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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1c2f7085bfcc2d780e23fc57b5986acdde7b2ce023f0a3b586303a9aed8618c9' 
  AND token = 'GQMeBQPfH65AaI1qUj/ORcb6r0dtBvob+B+O1/Yb5q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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