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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd99b07e5fe68eeb22cdcebf269bd19539f1ea16832ce5ab6faa9e1843a46d2c' 
  AND token = 'xYm9Wj/UkiYNa8IJiub+GqnwwIB0m40HLyyWt34qJ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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