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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8303ac29a19f67e32b2e12b496f9d0780b5fd1ff733936e8238a907952480805' 
  AND token = '8lXOcEjoveSD9dEBMwvldaqBNKySc/9BM6R4q4tjvxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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