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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a51bdf6d9ffc5a5b090d588acf9ddfed2e126ddf911a9bf9b1f71fe4cfb1122c' 
  AND token = '6F9oOGWD1Q/evJFCzHzuZkrtDpDd9uwj6UvJiYQZUsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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