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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eda8d57d6f848cb99152972c39021c3e088900856902b7a8b86d82bd28d2c8af' 
  AND token = 'YESTc6CVZBN1k7EEUl8o93tiDoVYx8zCeW/SdjrX7QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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