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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1aca4d7e532be4758cf374aff52002f9b551b515ca7da0288f76ecaf237b1d1' 
  AND token = 'oOS8xw7n7LpMw9LztD6S0x+oapMtIzU/AJqpM3olxDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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