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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '28aeb839bbb2c1a8258664ab0d8830e2b25518166293e9fe74bed76e6dc2b987' 
  AND token = 'cG8GQZUkL0NOjt5PcAdWxvMtpJZQQ8J2cE0inXl0ass=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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