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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0a70744537088cf850faf2c9c70efd377921c6e0184b73499a38732fdf52fea' 
  AND token = 'pOIro3LTqd2rsWUa1qtVlCJN3f5al67ErEX03uRr14E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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