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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '116028a09dcf4e8bcd197b7987b165287b4a2509a6d3eb1f8e26f85ed48e4829' 
  AND token = '1889glyTQF6uUJqsMb/XDxncLO59vc4ghR1OaeJLHV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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