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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca47fd5bdaf14de17ff1f92ef13c42c0598e22bcba24d436f11a60ab8b0eda02' 
  AND token = '9DcBAzvSf+7ZA0tnbIZTsVzNAV4TPx7J2pTUN7p2yk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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