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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'adfa46cf1c9124fa4a517bffeb4ed21c34de92af5e0f25270fa9b3a95fd01477' 
  AND token = 'RIC2F8L650njfK+mY1EHNIrMgJ0TwNONWw3dNvMlngA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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