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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8bc480c87846febf85f74b998361f13e6fdcb77065bb8c4ac2cfa8c08d9895a' 
  AND token = 'enR+8/et+0IrUepqEgzZKbl52c/e80yuLlm04XQOOF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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