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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fdc6c47d4fba9bf326e74cd4ad5ab474cf86f8fa55fd01b3973c1b8de7c43ab3' 
  AND token = 'b2DiGaDMxoQcyPNz7DYNbeexfQpIbusAjRrB6oPSSVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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