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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afc8bf34287a9f43ca34a0d22bdd8077e1e0d59fde4a2c6822139575112c917a' 
  AND token = 'ScWgM35jkb1I+7T6ITSIEATvSZT7Wv2O71qwOzo7pHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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