SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0117251f6892b531f156b1785c7aa35501c916a54faa7b07c2485a5f8b278894' 
  AND token = '6YqtiiWnGz+U+eKRG37J5Cof42BK8IsFnyRLXbp/ZpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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