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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed50ab2feb2441ee54126f3ba66d3c1cad9a08704a3fda87c3ed225c24e574eb' 
  AND token = 'lcdpxqzC8FsPQj9C95P+h1X+eXF3tQ9tdtuNNYNnyYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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