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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c6ea3d58094730f0df4336493b39632446016288d1e0c4653827ab69a2eac11b' 
  AND token = '/FoFPsSfHk2oCelPLF8kQxH6egIbYEjVznB5AafL3bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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