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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e97755ae301743f13c46fb3128fd75e25423fa759f0ee02f99a35c926801c893' 
  AND token = 'su/HIzyQ2ugFbEzRMNNiT3O/9+pb8Q3SgFKN8ugjuXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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