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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05ad51fef20fc1833cc65ed208e7a7ca481b5b2ac4ad3c4bb022699815c1b563' 
  AND token = 'bgoZeVgVk5tzo38PaUEAAME685AyVaHJLGJAO83N588=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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