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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'be50870acaacaffe10bb131b5c119d572a6eab6f7305ca21b8cb9d9111b0f2bb' 
  AND token = '/y83RI4ycps/7fk4tNh2E2hbGPGHx0LYF0CnrOgn/0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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