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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7e34a79360f9f740305d90d96e8c959c140e4f65ecd3c2f6fae7a853080d6f3f' 
  AND token = 'Yn9wxqqpSHO8NUwrCIecIhiiK3ktAdY8yFnG6iSYsDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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