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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11eb6b564d29962b5ff27ee5aa6e4f45c5afa56510cba54c5227dcf139e24fbd' 
  AND token = '/iC/3Qq2HYGHh6C0oVlB7/xiHicFXssiq3s3+IZx1Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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