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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b1754780d766d9e00e59f87c34e1c2a14de0bdd155f13ca5e36e06ba0e9a2c4' 
  AND token = 'AU+VTe5IOoi/WpkTSZdU6zL3X7aZwFJo+DWdsIFtknA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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