SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f8b0f3103997398b9fdda37dbd660b06ef9774ca41b5281d8f9b45548d0125bd' 
  AND token = '8Z5L/RkyczUE2qpxXEG7SSvcBhseYHv1fZNbjFHKjN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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