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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '55d0747edc499eb597737cbd3c448ba87e15ebfe9335c85aaaf87df651442f1b' 
  AND token = 'uY3IN1oqOuMqk6YvNp3n1cvKxIPKDlxKFpQcmEXagws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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