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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '468dc508e4d044282224d30716f9d68a2685ee4577f4680af3e7296c30b11ed3' 
  AND token = 'tQ0vRf1DTsGJG0+g0a3Jqne2hU9t1bO7L9PFR7ZulEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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