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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89f8ea9b92bffa5eb03265b9559b25daedb5584aa355bdf5a30ea96996c7dd9a' 
  AND token = 'Z9/azxtkBZjvWSHo/M0E4vLezLki0+rnC64HrLguNPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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