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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f5c6008e61eead2334a9fe752b385e5d4dfcf6d6cac5abc712e3959113af8103' 
  AND token = 'hSjlFv1wloc0+Da03zLgZ8Eh8v86YoT8MdPF8YUU2Uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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