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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e5dbb11d31939774d8bbcafd3f36c5b42a36ad0d8503c543d6a443723c8d37e9' 
  AND token = 'dATpK0GqgE90Dds8vnO+g3pa3M+cda+FQbQ8o9opHhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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