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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2cbd0d2af040c64c52e3029d8c92e862a5eb0aad1354f43047ef34f968891ec9' 
  AND token = 'aaxQ+OhMvVy7LN0+xQsbeVH8CI/OBXzfE4eEXFyTbmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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