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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8f9ab6625a7431d6ba13314f1dc48d1c5d84f63cae9c682471b9b91b48dd3d4' 
  AND token = '8He/Ba9X6ng879sXHQnhc/tcLk4E6gZRNeh3mAKMSpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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