SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '160559ad10c7273d6071134d2b314435adf2f6cd2c106c9a58d4a28668403011' 
  AND token = 'tFy+cAKfzUhHbStW46B8GykVv/cYkWNoWjiNZHC2UJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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