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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b2b51ed0c333db91317a90d6e9a0ce35e11c7cd572d246c32e11d5c0e2652e9' 
  AND token = '4HlLD+xTgeYuWqOGZL++NQ0QB2oH7Xzp7Daj58UNvQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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