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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fca0f7373d38f30f1226a92c93dd2b72550d8bb79ebc426a06dc8e6dca9590be' 
  AND token = 'AADVebZkrIkvZxINrVYGrZvpiorQAcipGp7j9xTxJLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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