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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f62ed0f6e10499d7c8fd6d8d755ae3f1e2a8266f8202a214d98a20812515b74' 
  AND token = 'AIsFd8z5JYA8iWyecBStNdjOOjHlLLMel3kqT7Gs/aA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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