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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '41da85534156e275924172f70868771a3095df4d897eeda8bba22137f91445b7' 
  AND token = 'L4mGShAXI3WP8I55SM5SS0RG4DjWfxBpf3BpPOOWEUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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