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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47948b5d69660eb7d03ba4a7be17e2816099fc3f67b70b15f44cf834792cf6ff' 
  AND token = 'xHMO2ZouzuK9lKp//iQLVkAiAcf0UlQ94ejoCL4rzmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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