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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cac9067288707cec9086d93ea3bd379ad054dd59a7e9d14393e08ee78de31510' 
  AND token = 'ymGyokJNO7vhXKX/IrpiMuAD8ZciBk5hyIMztjjhe1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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