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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ab1c822a496b40bfb3a81517b2735fbba1380b0b05b93edfb9358fc1df699154' 
  AND token = 'oFnSm+bqc0oS4vD4iw9n3p/x3HCvOxtz9R5PX7434D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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