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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '714497ab979b3a5caffc30d8d0d3675be0ee2f9c7576e1bf115ef9c0c03a579a' 
  AND token = 'lNC13nG6cklwiD/1WlIu1kcVvXTS6n5eVPGI5ASxceI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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