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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f218fe38ce2e5b51efba781470033ea302c82c27de98cf7c751cb0b1f2ae441a' 
  AND token = 'bG9Zv8efE/4ge2gcUJLGj/CelQwv8ECqrp1qs+GFX+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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