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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a3bf0d9bbc3e1719f458d83e7d3dd8db762ec8e7dfabc115ba7efa5276cd5e8' 
  AND token = 'eSIG1TmkZ5fly8BaSU1vq8NUzyRcMOxLDZuK1dRt8dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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