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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '590dda20a4485b8e3f049f88f4bdbc729891e83c48ab8b798e1dddce312ab376' 
  AND token = 'fjqsfCoF7Cr7iXMdHMz3E1RPmIf2rrqJwyLHZHK8OFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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