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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9be8334c9d64e18551752e7dd5fe37ae60f4e260a7ba0a414b735562c0ffd30a' 
  AND token = 'XeSoCQTpnbDqujyzCgA2zUElFdjjIHQF2fdwswA7LWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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