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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '353f6defc948b38d864722629ff3a82da4fb3de59d584bbfa902e8d5e4b3a53d' 
  AND token = 'j9z1lO0a5vtjCAik2I7EK9riaiDHCCQLzrSb7KJ0zrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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