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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2c667663cea796d7d3e9f0a43ded34cb7a1c32aca6c54d0d80067033a4e056b' 
  AND token = 'rxgBGeOkRBcMOvcWbTPIXJIJ0xvOeC2X+WXqwtrpgEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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