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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dfc5a008f47b7dcb4c5a81610ca7c3056b6b44d7f0cf1a1f5bdc89cf17e7f72f' 
  AND token = 'R3Tf+QUuaDyISseoX52yeh6tBmVvCB9s4ZrhGAvJpyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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