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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8216bb542dca333540762acf4bf7da1b2b8eb81439a83101170778c6c8f68d3' 
  AND token = 'g08rp1eUN0kDHnLiDLvavAsDBZQKI+8ULXxfbQegkgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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