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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5827e1613c83532cab03143feca4127510312e12016dc5c855f2a1499001bf7' 
  AND token = 'jnt+RDNH1YQueLDvOuULyvVALqai4VQiUogVyxLbH/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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