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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc5392b0be1abceac409ae805ba1cee65594eaac2a0e8f0b25c7fba79d85cdbe' 
  AND token = '/fxjlQIvvGH/i04DFEtoHkrHwnFtosqDg6EbbBAlm2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}