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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ba247e778ef9ca6ca0680499ef592f749daae44712c217f285d51b0e0687a688' 
  AND token = 'aUbkuAYc5Go3PcHxdC3KedJ2ssKkp8lxkUA568HHa6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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