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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fc547961ec720d9ef4dc1b69b69c2e949b9ea4e46f8ea173dba5b6140cecb502' 
  AND token = 'Lpa/L+Lyu2HYLELmC/T05KLs35zXxhkrQ3P0KHXlrH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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