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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '559f9b8b9bed7b579e4d3c685cb77267debd49d312166514880e0b84b2a508be' 
  AND token = 'E/m39XVqnVB58YxcsfoiR9elAo/w6TfWzyx2tJXLX4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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