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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5d810a77ee3f4e0c1e6aba59b26c719ade7f48623e697dbb285298b4160dce62' 
  AND token = 'jOqvFeUBB4AvU+4waVNSALnkamhJAa92nul0BSYbtFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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