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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfc7d8740877c23709a0a041d0cb0d5cd07fc2adf650fbb579eca2ca6c37de17' 
  AND token = 'g5OODA1YLJZQkHw84SaS/4NNdvUhNIqIr/sjDZ+6r6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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