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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53965eb4b2a3bb763685d2b3dd172e62ad1afa1e8b1b41c196224c34fcf5e03d' 
  AND token = 'TrKxTPMceJCKZTPlSqRxwur2ZdcxBWOdprs2g9VUw9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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