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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72b219942fde40a56939c54f32d589ddc0845e591af2cdaad6e57e54d2c354ec' 
  AND token = 'vxeon6B1zsmKhMFAVu+Nrt9kDrGJ8Ipk+yz2mMgU8IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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