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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4fe2898f056d533b061e9ed63ec940b0f071fe0f296dcef05e8a760924d3771a' 
  AND token = 'hNdBZxNbp0fHR7I9wTf8B0tjhMBBxc3MAiOzOJB4Sho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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