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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b490131528d8e4ce6cb13961b42721600f25158ccff77c1a98fa56b86ee9b1ef' 
  AND token = '2dl9kmNTk9bwxpoM6wQhC7WeW3f/FwXEGON/sRzEUsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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