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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '13886d1fb4ddebff9b832003e81f0aeab8d8f34aaea0099fb07b73b65101d1ba' 
  AND token = 'Ka/BAoMD3ggwMiDwKhgwj7LoptcoVhWUl6rTu40Cm1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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