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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9d0c302349890b8e0118bfc528f00229f2a8d094dd77cc294d7d3222f98ccf9' 
  AND token = 'JHazvCVhN1l2YZNLpO0h59SY+/D6IYJdG1eicaDcSsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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