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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '633d6e95fbae46280963694baf558513b0c71ceaf32fde8b2275fdae599a8ce5' 
  AND token = 'd9W10aXB/GcWOVuyg+Tcmx1Un5cmLXIUCS1VNWKs58E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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