SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5bd9872a85feff29159f3d7e6038066c71234210aaa5eafef36db253564333e6' 
  AND token = '7CY7GGE5YlhVzzpECW6pWw9FnSNJZPLpfa/k/2GdhbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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