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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8504a4ec1a75bfcf8f15ba746f404de743b71c83a42ebe68a516ee789c429544' 
  AND token = '9f/TnAdcu/3oTyQwbCQMvnn35BMHY2M+K75ejLDmSdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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